Wolf Tooth Components Drop-Stop Chainring: 32T x 96 BCD, for XTR M9000 CranksDesigned to fit 96 Asymmetric BCD XTR9000 9020 Cranksets. These rings feature the patent pending Drop Stop asymmetrical tooth design for the best in wear life, mud clearance, and chain retention. Only compatible with Shimano XTR 9000 or 9020 cranksets Features Wolf Tooth's Drop Stop tooth design for maximum chain retention Drop Stop chainrings are designed for use with 1x9, 1x10, 1x11 and 1x12 drivetrains Compatible with all 10 , 11 , and 12 speed